US20170305387A1 - Switch state detection device for vehicle - Google Patents

Switch state detection device for vehicle Download PDF

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Publication number
US20170305387A1
US20170305387A1 US15/517,835 US201515517835A US2017305387A1 US 20170305387 A1 US20170305387 A1 US 20170305387A1 US 201515517835 A US201515517835 A US 201515517835A US 2017305387 A1 US2017305387 A1 US 2017305387A1
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United States
Prior art keywords
switch
state
pull
port
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US15/517,835
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English (en)
Inventor
Tatsuya Koike
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokai Rika Co Ltd
Original Assignee
Tokai Rika Co Ltd
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Filing date
Publication date
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Assigned to KABUSHIKI KAISHA TOKAI-RIKA-DENKI-SEISAKUSHO reassignment KABUSHIKI KAISHA TOKAI-RIKA-DENKI-SEISAKUSHO ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOIKE, TATSUYA
Publication of US20170305387A1 publication Critical patent/US20170305387A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01516—Passenger detection systems using force or pressure sensing means
    • B60R21/01524—Passenger detection systems using force or pressure sensing means using electric switches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01544—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment
    • B60R21/01546—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment using belt buckle sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B60R2022/4808—Sensing means arrangements therefor
    • B60R2022/4816—Sensing means arrangements therefor for sensing locking of buckle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B60R2022/4808—Sensing means arrangements therefor
    • B60R2022/4858—Sensing means arrangements therefor for sensing pressure on seat

Definitions

  • the present invention relates to a switch state detection device for a vehicle that detects states of switches such as a switch that detects fastening of a seatbelt and a switch that detects sitting of a vehicle occupant, or the like.
  • a technology in which a buckle switch that detects insertion of a tongue is provided at a buckle of a seatbelt device and detects fastening of the seatbelt is known as an example of a switch state detection device for a vehicle.
  • JP-A Japanese Patent Application Laid-Open
  • 2009-240528 proposes a technology that detects fastening of a seatbelt when a movable contact is operated by insertion of a tongue.
  • a seatbelt device that detects fastening of a seatbelt in this manner is provided with, for example, a movable contact 52 at a buckle switch 50 as shown in FIG. 6A .
  • This seatbelt device detects two states, “fastened” and “unfastened”.
  • the movable contact 52 makes contact between a power supply contact 54 and an insertion switch input contact 56 that detects fastening of the seatbelt, and current flows to the insertion switch input contact 56 .
  • the movable contact 52 moves and makes contact between the power supply contact 54 and a removal switch input contact 58 that detects unfastening of the seatbelt, and current flows to the removal switch input contact 58 .
  • a detection circuit that is employed is, for example, the circuit illustrated in FIG. 6B .
  • a power supply V is connected to the power supply contact 54 .
  • the insertion switch input contact 56 and removal switch input contact 58 are each connected to a microcontroller 60 .
  • the insertion switch input contact 56 and the removal switch input contact 58 are earthed via respective pull-down resistances R. Accordingly, the microcontroller 60 may detect whether or not the seatbelt is fastened.
  • the movable contact 52 causes a state of continuous connection, of the power supply V with the insertion switch input contact 56 or of the power supply V with the removal switch input contact 58 . Therefore, current is continuously flowing and power is being continuously consumed. This power consumption is particularly problematic if the power supply is a battery and wireless communications or the like are used to transmit detection results of switch states such as seatbelt fastening results and the like.
  • an input port of a microcontroller has high impedance and most of the current flows through the pull-down resistance.
  • the resistance constant may not be increased, because of increasing susceptibility to noise.
  • the present invention has been made in consideration of the situation described above, and an object of the invention is to reduce power consumption caused by a pull-down resistance.
  • a first aspect of the present invention for achieving the object described above includes: a switch unit to which a power supply is connected, the switch unit switching the connection with the power supply between a connected state and a disconnected state; and a control unit that is connected with the switch unit, the control unit including a detection port that detects a state of the switch unit and a control port that is connected with the switch unit via a pull-down resistance and that controls whether or not the pull-down resistance operates, and the control unit controlling the control port such that the pull-down resistance does not operate when the switch unit is in the connected state and such that the pull-down resistance operates when the switch unit is in the disconnected state.
  • the switch unit is connected to the power supply and switches the connection with the power supply between the connected state and the disconnected state.
  • the control unit includes the detection port and the control port.
  • the detection port detects states of the switch unit, which is to say the connected state and the disconnected state.
  • the control port is connected to the switch unit via the pull-down resistance and controls whether or not the pull-down resistance operates.
  • the control unit controls the control port such that the pull-down resistance does not operate when the switch unit is in the connected state and the pull-down resistance does operate when the switch unit is in the disconnected state. That is, whether or not the pull-down resistance operates can be controlled by control of the control port. Thus, power may be reduced compared to a structure in which a pull-down resistance operates continuously. Therefore, power consumption caused by the pull-down resistance may be reduced.
  • the switch unit may include: a first contact that is connected to the power supply; a second contact that is connected to the detection port and that is connected to the control port via the pull-down resistance; and a movable contact that switches between the connected state and the disconnected state by connecting and disconnecting the first contact with the second contact.
  • control unit may detect the connected state and the disconnected state by detecting whether or not electricity is being conducted from the power supply to at least one of the detection port and the control port.
  • the control unit when the switch unit switches from the connected state to the disconnected state, the control unit may control the control port such that the pull-down resistance operates after a predetermined duration has passed.
  • noise in the predetermined duration may be isolated and the control unit may detect the conduction of electricity.
  • the predetermined duration that is employed may be, as in an eighth aspect of the present invention, a duration with which the control unit can isolate detection of electricity conduction from noise.
  • the switch unit may include a first switch portion that is put into the connected state when a tongue of a seatbelt is inserted into a buckle, and a second switch portion that is put into the connected state when the tongue is removed from the seatbelt; and the control unit may be provided with respective the detection ports and the control ports corresponding with the first switch portion and the second switch portion.
  • the switch unit may include a third switch portion that is put into the connected state when a vehicle seat is being sat on, and a fourth switch portion that is put into the connected state when the vehicle seat is not being sat on; and the control unit may be provided with respective the detection ports and the control ports corresponding with the third switch portion and the fourth switch portion.
  • the switch unit may be switched to the connected state by at least one of a seatbelt being fastened and a vehicle occupant sitting on a vehicle seat.
  • an effect is provided in that power consumption caused by a pull-down resistance may be reduced.
  • FIG. 1 is a diagram showing schematic structures of a seatbelt device according to an exemplary embodiment of the present invention.
  • FIG. 2A is a diagram for describing control by a microcontroller in accordance with a state of a buckle switch.
  • FIG. 2B is a diagram for describing control by the microcontroller in accordance with another state of the buckle switch.
  • FIG. 2C is a diagram for describing control by the microcontroller in accordance with the another state of the buckle switch.
  • FIG. 3 is a flowchart showing an example of a flow of processing that is executed by the microcontroller of the seatbelt device according to the present exemplary embodiment.
  • FIG. 4 is a block diagram showing an example of structures that detect both fastening of a seatbelt and sitting.
  • FIG. 5A is a block diagram showing an example in which a sitting sensor is structured by two switches.
  • FIG. 5B is another block diagram showing the example in which the sitting sensor is structured by the two switches.
  • FIG. 5C is still another block diagram showing the example in which the sitting sensor is structured by the two switches.
  • FIG. 6A is a diagram showing a structural example of contacts of a seatbelt device that detects fastening of a seatbelt.
  • FIG. 6B is a block diagram showing an example of a detection circuit that detects fastening of the seatbelt.
  • FIG. 1 is a diagram showing schematic structures of the seatbelt device according to the exemplary embodiment of the present invention.
  • a buckle switch 16 is provided at a buckle 14 into which a tongue 12 of a seatbelt is inserted.
  • a microcontroller 18 detects states of the buckle switch 16 .
  • the microcontroller 18 is provided with an insertion switch input port 24 that conducts electricity from a power supply V via the buckle switch 16 when the tongue 12 is inserted into the buckle 14 .
  • the microcontroller 18 is also provided with a removal switch input port 22 that conducts electricity from the power supply V via the buckle switch 16 when the tongue 12 is removed from the buckle 14 .
  • the microcontroller 18 is further provided with a removal control port 20 to which a pull-down resistance R 1 is connected and an insertion control port 26 to which a pull-down resistance R 2 is connected.
  • the microcontroller 18 controls the respective control ports so as to control whether or not the pull-down resistances R 1 and R 2 operate.
  • the removal control port 20 controls whether or not the pull-down resistance R 1 operates and the insertion control port 26 controls whether or not the pull-down resistance R 2 operates.
  • the buckle switch 16 includes three contacts 16 A, 16 B and 16 C.
  • the contact 16 A is connected to the power supply V, one side of which is earthed.
  • the contact 16 B is connected to the removal switch input port 22 of the microcontroller 18 , and is also connected to the removal control port 20 via the pull-down resistance R 1 .
  • the contact 16 C is connected to the insertion switch input port 24 of the microcontroller 18 , and is also connected to the insertion control port 26 via the pull-down resistance R 2 .
  • the microcontroller 18 is further provided with a timer 28 , which counts out a predetermined duration.
  • the predetermined duration counted out by the timer 28 is specified to be a duration long enough that noise may be isolated when electricity conduction to the removal switch input port 22 or the insertion switch input port 24 is being detected.
  • FIG. 2A to FIG. 2C are diagrams for describing the control by the microcontroller 18 in accordance with states of the buckle switch 16 .
  • the buckle switch 16 In an initial state in which the tongue 12 has been removed from the buckle 14 , as shown in FIG. 2A , the buckle switch 16 is in a state of conducting electricity from the power supply V to the removal switch input port 22 .
  • the microcontroller 18 controls the removal control port 20 , the removal switch input port 22 and the insertion switch input port 24 into a high impedance (high-Z) state and controls the insertion control port 26 into a low (L) output state. At this time, the microcontroller 18 has been put into a sleep mode in order to reduce power consumption.
  • the microcontroller 18 detects a voltage change at the insertion switch input port 24 , switches into a wake mode, and starts counting by the timer 28 . Electricity is conducted to the insertion control port 26 of the microcontroller 18 via the pull-down resistance R 2 and electricity is also conducted to the insertion switch input port 24 . This may be detected at one or both of the ports. Thus, the microcontroller 18 may detect the insertion of the tongue 12 into the buckle 14 .
  • the microcontroller 18 controls the removal control port 20 from the high impedance (high-Z) state to the low output state, and controls the insertion control port 26 from the low output state to the high impedance (high-Z) state.
  • FIG. 3 is a flowchart showing an example of a flow of processing that is executed by the microcontroller 18 of the seatbelt device 10 according to the present exemplary embodiment.
  • step 100 the microcontroller 18 performs control to put the removal control port 20 into the high impedance state and to put the insertion control port 26 into the low output state, and then the microcontroller 18 proceeds to step 102 . That is, the state shown in FIG. 2A is produced. As described above, because the removal control port 20 and the removal switch input port 22 are both in the high impedance state, hardly any current flows through the removal side ports. Meanwhile, because the insertion control port 26 is in the low output state, the insertion side ports are in equivalent states with the pull-down resistance R 2 operating and pulling down the insertion switch input port 24 . Thus, the pull-down resistance may be caused to operate and inputs to the microcontroller 18 may be kept stable even though power consumption is reduced.
  • step 102 the microcontroller 18 makes a determination as to whether the insertion switch input port 24 is in a high state. This determination is based on a voltage change of the insertion switch input port 24 according to whether the buckle switch 16 is conducting electricity from the power supply V to the insertion switch input port 24 due to insertion of the tongue 12 into the buckle 14 . The microcontroller 18 waits until the result of this determination is affirmative and then proceeds to step 104 .
  • step 104 the microcontroller 18 makes a determination as to whether the insertion switch input port 24 has stayed in the high state for the predetermined duration. This determination is made by the high state of the insertion switch input port 24 being counted out to the predetermined duration by the timer 28 . If the result of this determination is negative, the microcontroller 18 returns to step 102 and repeats the processing described above. If the result is affirmative, the microcontroller 18 proceeds to step 106 .
  • step 106 the microcontroller 18 controls the removal control port 20 to the low output state and controls the insertion control port 26 to the high impedance state, and then proceeds to step 108 . That is, the state shown in FIG. 2C is produced and, as described above, because the insertion control port 26 and the insertion switch input port 24 are both in the high impedance state, hardly any current flows through the insertion side ports. Meanwhile, because the removal control port 20 is in the low output state, the removal side ports are in equivalent states with the pull-down resistance R 1 operating and pulling down the removal switch input port 22 . Thus, the pull-down resistance may be caused to operate and inputs to the microcontroller 18 may be kept stable even though power consumption is reduced.
  • step 108 the microcontroller 18 makes a determination as to whether the removal switch input port 22 is in the high state. This determination is based on a voltage change of the insertion switch input port 24 according to whether the buckle switch 16 is conducting electricity from the power supply V to the removal switch input port 22 due to removal of the tongue 12 from the buckle 14 . The microcontroller 18 waits until the result of this determination is affirmative and then proceeds to step 116 .
  • step 110 the microcontroller 18 makes a determination as to whether the removal switch input port 22 has stayed in the high state for the predetermined duration. This determination is made by the high state of the removal switch input port 22 being counted out to the predetermined duration by the timer 28 . If the result of this determination is negative, the microcontroller 18 returns to step 108 and repeats the processing described above. If the result is affirmative, the microcontroller 18 returns to step 100 and repeats the processing described above.
  • the pull-down resistances may be caused to operate even though power consumption by the pull-down resistances is reduced. As a result, the lifetime of a battery when wireless communications are used to transmit detection results of switch states may be extended.
  • the switch state detection device for a vehicle is applied to a seatbelt device, but this is not limiting.
  • the switch state detection device may be applied to detection of sitting using a sitting switch that is switched when a vehicle seat is sat on.
  • the device may be provided at both the buckle switch 16 and a sitting switch 30 , and the microcontroller 18 may detect both fastening of the seatbelt and sitting.
  • the sitting switch 30 is provided with three contacts 30 A, 30 B and 30 C.
  • the microcontroller 18 is provided with the removal control port 20 , the removal switch input port 22 , the insertion switch input port 24 and the insertion control port 26 corresponding with the buckle switch 16 , and is further provided with ports corresponding with the sitting switch 30 (a non-sitting control port 32 , a non-sitting switch input port 34 , a sitting switch input port 36 and a sitting control port 38 ) similarly to the buckle switch 16 .
  • pull-down resistances R 3 and R 4 are provided at the sitting switch 30 .
  • the timer 28 for detecting fastening of the seatbelt and a timer 40 for detecting sitting are provided.
  • both seatbelt fastening detection and sitting detection may be implemented by the microcontroller 18 controlling the ports, and power consumption may be reduced in the same manner as in the above exemplary embodiment.
  • FIG. 4 an example is illustrated in which sitting of a vehicle occupant is detected by a single sitting switch 30 A.
  • a sitting sensor 42 may be employed that detects sitting of a vehicle occupant with two switches (SW 1 and SW 2 ).
  • the two switches SW 1 and SW 2 are each provided with a movable contact, a non-sitting contact and a sitting contact.
  • the movable contact of switch SW 1 is connected to a power supply V
  • the non-sitting contact of switch SW 1 is connected to the movable contact of switch SW 2
  • the sitting contact of switch SW 1 is connected to the sitting contact of switch SW 2 .
  • the sitting contact of switch SW 2 is connected to the non-sitting switch input port 34 of the microcontroller and is also connected to the non-sitting control port 32 via the resistance R 3 .
  • the sitting contact of switch SW 2 is connected to the sitting switch input port 36 and is also connected to the sitting control port via the resistance R 4 .
  • the microcontroller 18 controls the non-sitting control port 32 , the non-sitting switch input port 34 and the sitting switch input port 36 into the high impedance (high-Z) state and controls the sitting control port 38 into the low (L) output state.
  • the switches SW 1 or SW 2
  • FIG. 5B electricity is conducted from the power supply V to the sitting switch input port 36 .
  • the microcontroller 18 detects a voltage change at the sitting switch input port 36 , counts out a predetermined duration and, after the predetermined duration has been counted out, controls the ports into the state illustrated in FIG. 5C . That is, it is sufficient if the microcontroller 18 controls the non-sitting control port 32 from the high impedance (high-Z) state to the low output state and controls the sitting control port 38 from the low output state to the high impedance (high-Z) state.
  • switches are not limited thus. Non-contact switches such as magnetic switches, electrostatic switches and the like may be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Automotive Seat Belt Assembly (AREA)
US15/517,835 2014-10-15 2015-10-02 Switch state detection device for vehicle Abandoned US20170305387A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014-210643 2014-10-15
JP2014210643A JP2016078573A (ja) 2014-10-15 2014-10-15 車両用スイッチ状態検出装置
PCT/JP2015/078105 WO2016059984A1 (ja) 2014-10-15 2015-10-02 車両用スイッチ状態検出装置

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US20170305387A1 true US20170305387A1 (en) 2017-10-26

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US15/517,835 Abandoned US20170305387A1 (en) 2014-10-15 2015-10-02 Switch state detection device for vehicle

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US (1) US20170305387A1 (ja)
EP (1) EP3208158A4 (ja)
JP (1) JP2016078573A (ja)
WO (1) WO2016059984A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10053054B1 (en) * 2017-09-12 2018-08-21 Preemptec Corporation Child car seat for lock-in prevention
US20200094761A1 (en) * 2018-09-24 2020-03-26 Novelic D.O.O. Seat occupation, vital signs and safety belt lock sensor system for rear vehicle seats without power supply

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Publication number Priority date Publication date Assignee Title
CN106184114A (zh) * 2016-07-28 2016-12-07 昆山浩硕精密机械有限公司 一种新型按摩汽车安全带
CN106114449A (zh) * 2016-07-28 2016-11-16 昆山浩硕精密机械有限公司 一种汽车安全带及其检测装置
CN110154977B (zh) * 2019-05-27 2020-06-26 上海星融汽车科技有限公司 识别车载终端被移除的方法及其系统

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US20080143508A1 (en) * 2006-12-15 2008-06-19 Denso Corporation Occupant detection system and occupant protection system

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JPH1055238A (ja) * 1996-08-09 1998-02-24 Hitachi Ltd ペンコンピュータ及びその座標入力装置
JP3795231B2 (ja) * 1998-06-11 2006-07-12 エヌエスケー・オートリブ株式会社 車両用乗員保護装置
KR20010018903A (ko) * 1999-08-23 2001-03-15 이현복 자동차용 버클의 로킹 상태 검출회로
JP5352524B2 (ja) * 2009-11-30 2013-11-27 日立オートモティブシステムズ株式会社 モータ駆動装置

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US20080143508A1 (en) * 2006-12-15 2008-06-19 Denso Corporation Occupant detection system and occupant protection system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10053054B1 (en) * 2017-09-12 2018-08-21 Preemptec Corporation Child car seat for lock-in prevention
US20200094761A1 (en) * 2018-09-24 2020-03-26 Novelic D.O.O. Seat occupation, vital signs and safety belt lock sensor system for rear vehicle seats without power supply

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EP3208158A4 (en) 2018-06-20
JP2016078573A (ja) 2016-05-16
WO2016059984A1 (ja) 2016-04-21
EP3208158A1 (en) 2017-08-23

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